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Children's Dictionary
beyond the shadow of a doubt with complete certainty; indeed.
fog a condition of mental confusion or lack of certainty. [1/4 definitions]
must1 used to express, with certainty, some opinion or thought that is based just on what seems logical. [1/4 definitions]
or used to indicate different possibilities because of lack of certainty. [1/3 definitions]
uncertain not knowing with certainty; not sure. [1/3 definitions]